✔ 最佳答案
年份和月份都用 in ( in 2007, in August )
節日通常用 at ( at Christmas , at Chinese New Year , at Easter
但「平安夜」會用On Christmas Eve )
星期用 on ( on Monday , on Friday )
四季用 in ( in summer , in spring )
早上 in the morning / 中午 at noon /下午 in the afternoon /
黃昏 in the evening / 晚上 at night
這裡有一些練習
http://www.englishpage.com/prepositions/prepositions.html